There are some steps available to change the Yahoo mail password on mobile.

  1. Open the Yahoo mail account.
  2. Go to the setting 
  3. Then, there will be account info option available.
  4. Click on account info
  5. Then, click on the change password option.
  6. Enter the password to confirm twice.
  7. Click on save.

To get more information Read this

Yahoo Toll-Free Number

+1-877-618-6887 (USA)

+44-800-051-3717 (UK)

+61-180-082-5192 (AUS)